Least positive integer m with pi(m*n) = phi(m), where pi(.) is the prime-counting function and phi(.) is Euler's totient function.

A247601

Least positive integer m with pi(m*n) = phi(m), where pi(.) is the prime-counting function and phi(.) is Euler's totient function.

Terms

    a(0) =2a(1) =1a(2) =13a(3) =31a(4) =73a(5) =181a(6) =443a(7) =2249a(8) =238839a(9) =6473a(10) =30001a(11) =40123a(12) =108539a(13) =251707a(14) =637321a(15) =7554079a(16) =4124437a(17) =241895689a(18) =27067097a(19) =69709723a(20) =179992919a(21) =1019958623a(22) =1208198863a(23) =3140421743a(24) =8179002173

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